Shock-absorbing and noise-eliminating device



E. 'B. STIMPSON SHOCK AB SORBING AND NOISE 'ELIMINATING DEVICE 2 Sheets Sheet 1 Filed March '7, 1925 rltrl ATTORNEY Dec. 7, 926. I I 1,609,437

E. B. STIMPSON SHOCK ABSORBING AND NOISE ELIM INA'IKING DEVICE Filed March '7, 1925 Q SheetS-Shee t jc 'q- Fig: 2- I 46 I 5;; x V 3o 1 I .'-f I *2? 11 an 29 I 32 j as 1 O i "HI 8 T 17 chine isprovided with a post or standard 11 Patented Dec. 7 1926 recast earner eerie-a0 EDWIN B. STIIVEPSON, OF BROOKLYN, NEW YORK, ASSIGNOR COMPANY, OF BROOKLYN, NEW' YORK.

v SHOCK-ABSORBING AND Norsn-Emrvrrmirme nnvrcn.

Application filed March 7, 1925. Serial No. 13,758.

This invention relates to shock-absorbing devices for treadle-operated machines.

In the operation of machines of the foot treadle type, the reciprocation of movable parts connected to the treadle mechanism tends to produce an objectionable degree of noise, particularly at the conclusion of the 'idle or return stroke of the operating parts.

1 general object of the present invention is to provide means for cushioning or absorbing the shock of the moving parts as they strike the stop members which limit their motion in one or both directions.

The invention herein described and claimed is more particularly applicable to machines in which two treadle members are made use of and a feature of the invention resides in the connecting of a shock-absorb ing device of a pneumatic type toparts connected to the respective treadle members.

In one embodiment of the inventionthe shock-absorbing device takes the form of a pair of telescoping cylinders movable toward each other in one direction of movement of the connected treadle members to thereby provide a cushioning or shock-absorbing effect. In another vmodification of'the invention the slioclcabsorbing device takes the form of two sets of cylinder and piston members formed in a common structure and having the diameter and stroke of the pistons arranged to fit the requirements of the stroke of the respective treadle members. In this form of the invention the cushioning or shock-absorbing effect is utilized in both directions of movement of the 'treadles.

Other features of the invent-ionwill be hereinafter referred to. I V

In thedrawings, y

Figure 1 is a view in side elevation and vertical section of a portion of a treadleoperated machine equipped witha shockabsorbing device embodying the invention.

Figure 2 is a view similar to Figure 1 showing a modified form of the invention.

Referring to the drawings for a more detaileddescription of the invention, a base member of the framework of any treadleoperated machine such asa rivet setting main which a reciprocating part 12 is guided for vertical movement. A treadle lever 13 is pivoted at Men the post-11 so that'dearession of the treadle member 15 by the act of theoperator will elevate the other nection 16 raise .into the bore of' th'e cylind to each other other cylinder and end of the lever the member 12 along the gpideway provided by the post or standard 1 A second treadle lever 17 may be provided.

to actuate any suitable mechanism in the machine that is to be operated in conjunction or separately from the treadle 15 already referred to.

' In order to the parts which in each case takes place upon the upward movement of the treadle members 15 and 18, the shock absorbing device 19 embodying the invention herein described isconnected at its opposite ends to the link- 16 and the treadle member 17. The shockabsorbmg device 19 consists of two hollow cylinders 20 and tion to each otherand having their inner ends open to eacl other and their outer ends closed by suitable closure members 22 ending in terminal mem formed forpivotal oers 23 v attachment to the link 16 and lever .17 already referred to. I

The lower cylinder 21a provided with an elongated slot 24 near the lower end thereof throughpwhicha pin or stud 25 car- 'ried by a sleeve'26 projects." With this construction the cylinder-21 may slide within the sleeve 26 to the extent permitted by the elongated slot 24. In the tion of the cylinder 21, as is shownin Figure l of the drawing, the slot 24 is raised above the upper edgeof the sleeve 26 to provide a port or opening for theadmission of air lers in the outward movement of the cylinders with relation which is produced by the de pJression of e1thertreadle member 15 or 18.

,pon the return stroke of either treadle member the corresponding cylinder movesinwardly into telescoping relation with the I in so doing causes the lower cylinder 21 tomove inwardly into the sleeve 26 to thereby move the port 24 into the sleeve 26 and thereby close the port to completelyshut off the passage of air there- 13 and through a link con- I cushion the returnstrolre. of

21 havinga 'teles copic'relw T0 EDWIN B. STIMPSON i provided with a treadlelfi I uppermost posithrough or to causethe port to assumea partially closed position to correspondingly re- I strictthe flow of air'th'erethrough. It will. be seen that the closingof the port 24 in the manner described will-causethe further relativeinward movement of the cylinders 20 and 21 to act ag'ainst a confined volume of air which serves to provide the cushioned 1 than the upper I the treadle effect sought/for. The-completion of the return movement of the parts is therefore cushioned so that there is no impact or ar at the terininaton of the stroke when the moving parts engage the limiting or stop members. V

In the form of the invention shown in Figure 2 of the drawing the port'or valve employed in the device shown in Figure 1' s not used, a slow-leak or bleeding type of air portbeing utilized instead to provide for a cushioning jeiiect in both directions of move ment of the oonnectedparts.

In Figure 2c the shock-absorbing device 27-is made up of two cylinder members 28 and '29'mounte'd base to base and opening in opposite directions. The upper cylinder member 28has' a relatively narrow diameter and arelatively great length andcoopera'tes with apiston member 30 attached at its upper end at 31 to the link memberlti'ot the machine.

The lower cylinder 29 is relatively shorter cylinder 28 and has a relatively larger diameter than that of the cylinder 28. The cylinder 29 is provided with a piston 32 which is connected through the terminal member 33 to the treadle lever The difference in length and diameter of thetwo sets of cylinders and pistons is designed to correspond to the relative differences in the length of stroke andthe momentum of the respective connected parts.

vIn other words,the length of the stroke of the movable'pa rt 12 which is actuated by 15 is substantially greater than the. movement of the parts actuated by the treadle 18.' In addition to this the weight and consequently the momentumfor" the parts actuated by the treadle 15 are less than the momentum of the parts actuated weight and by the'treadle 18. 7 V p In order to cushion the stroke of the parts in both directions of movement the upper cylinder 28 is provided with'a' plug 34. having a slow-leak' port 35 formed therein an a corresponding plug 3 6 w'ith a port 37' provided for the lowercylinder 29. i

, In operation depression of the name member 15' elevates the part 12 and lifts the plunger or plston 30 in the upper cylinder28. The length of the cylinder28 is relatively great to accommodate the correspondingly great travel of the movable part 12. Release of the treadle 15 permits the parts to descend to their normal position under the action of gravity and this stroke, as well as the stroke of the rising movement of the piston 30, is restricted or cushioned by the passage of air port 35 in the plug 34.

On therother hand operation of thelfoot ,treadle 18 and its subsequent release pro-1 'duces first downward and then upward or the parts in parts,

through the restricted by the slow passage of air through the leak- I ing port 37in theplug 36.

It will be seen that the shock-absorbing device in this embodiment of the invention, as well as in that shown in Figure 1 of the drawing, is connected at its opposite ends to the treadle lever 17 and to the link 16 operated by the treadle 15 so that both cylinders cooperate in the cushioning e'ii ect when eithertreadle member 15 or 18 is operat'ed. In otlierwords, the shock-absorbing device is common to both treadle members and participates in the control of each or both. 7 I

What I claiin is V 1. In a sli ock-absorbing device for reversible motion machine parts, two tubular 'memfor the othertubul'ar nemb er, means permitting a limited movement of the tubular member within the cap'member, and oneof said members being provided with a port arranged to be opened by relative movement one direction and closed by movement of the parts in the other direction.

2 In a shock-absorbing device for two relatively inovable' machine parts, a tubular member closed atone end and attached at the closed end; to one of the parts, another tubular member: having telescopic relation with the' first-named tubular member, a cap member slidably mounted on the outer end tubular member and 7 attached to the" other of said parts, said cap I member being'provided with" a pin and said of the second-named tubular 'member being provided with an elongated slot lnto whlch fsa1d pin extends to limit movement ofthe' tubular member in the cap member, said" elongated slot providing a port for regulating the cushioning effect ofsaid device; I v V 3'. A shock-absorbing device for two relatively movable machine parts, two piston members attached to the 'respective'jmovable a cylinder for each piston, and said cylinder members being formed in a unitary structure back to back, whereby a pneumatic cushioning device is'provided common to the two movablepartsr I 1 "4. In a shock-absorbing device "for two relatively movable machine parts,'two piston members "each connected to one of said parts, a cylinder for each of said pistons, said cylinders being formed into a unitarystructure back to back, the cylinder and piston for one of said parts having a relatively'smalljdiameterand having a substantial length to provide for a relatively considerablelength of stroke, the other cylinder and piston having a relatively large diameter and providing for a relatively short length of stroke, and a shock-absorbing device of the pneumatic said cylinders being provided With ports of type connected in common to parts moved restricted size to control the flow of air into by said treadles whereby operation of either 10 and out of said cylinders in the operation trea-dle Will be controlled by said shock-ab- 5 thereof. sorbing device.

5. In a shook-absorbing device for. a In testimony whereof I afix my signature. treadle-operated machine, a pair of treadles, EDWIN B. STIMPSON. 

